考虑TA饱和的双端故障定位新方法

作者：王波1,郑煜2,陈晓刚2 日期：2010-03-26/span> 浏览：4459 查看PDF文档

考虑TA饱和的双端故障定位新方法

王波1,郑煜2,陈晓刚2
(1.浙江大学 电气工程学院,浙江 杭州 310027;2.杭州电力局,浙江 杭州 310009)

摘要：针对线路分布参数模型中电流互感器(TA)饱和导致某一侧电流畸变或不可用的问题,提出了一种适用于任意故障类型的输电线路故障测距新算法。该方法利用两侧电压和未饱和侧电流,根据过渡阻抗的纯电阻性质,得出当且仅当在故障点处无功功率为零。进而利用了一种实用的最优化算法,该测距方法无需事先判断故障类型,无需求解复杂的方程，而是利用搜索迭代的方法。PSCAD的仿真结果也证明了该方法正确、有效,并且不受故障类型、过渡电阻等因素的影响。
关键词：故障测距;线路保护;电流互感器饱和;分布参数
中图分类号：TM711文献标识码：A文章编号：1001-4551(2010)02-0104-03

Novel fault location algorithm for two-terminal transmission lines by saturation of current transformers
WANG Bo1, ZHENG Yu2, CHEN Xiao-gang2
(1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.Hangzhou Bureau, Hangzhou 310009, China)
Abstract: Aiming at the problem of that current transformer(TA) saturation leads to current distortion or be not awailable in distributed parameter transmission line model, a new fault location algorithm was proposed considering the saturation of current transformers. The voltage and current profiles along a transmission line were calculated by using sequential network models, the two terminal voltages and the currents from the unsaturated end. Since fault impedance was of pure resistance, the fault could be accurately located at where the reactive power was zero. So the method was independent of fault type, without solving complex equations. Results of PSCAD based simulation prove that the method is correct and efficient.
Key words: fault location; line protection; current transformer(TA) saturation; distributed parameter
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